P.M.
Redness, a bit of swelling, even a mild fever are not only normal with vaccines, they are usually a sign that the body is mounting exactly the immune response (which often causes inflammation in the early stages) that is hoped for. Some kids react more strongly, some less so, but unless the reaction itself becomes problematic or simply too uncomfortable, it's a good thing.
If further symptoms develop, it could be either that your son has also contracted a coincidental illness or allergy, or that he is reacting inappropriately to the shots. But what you're describing sounds normal and even desirable. The vaccine is prompting the production of antibodies, and they are rushing to the site of the vaccination.